Drill



, DRILL. 'APPLICATION FILED APR. 30| 19|9.

l* Patented June 7, 1921.

"v magg A TTORNE Y narra stares f DRILL.

Specification of Letters Patent.v i Pgmgntgd Jun@ 7, 192i Applicationinea .ap-.fn so, 1919. serial no. 293,729.

New York, borough of Brooklymlings county, State of New York, haveinvented certain new and useful Improvements in Drills7 of which thefollowing is a specifica-V tion.

This invention relates to drills, and more particularly to drills of theportable type.

My inventionv in its broadest aspect comprehends an improved means forsecurely holding thework in position to be operated upon by the drill.lt is quite common in the art to employv power operated clamps for Athispurpose, but so far as lf am advised all such'clamps have provedineflicie'nt and unsatisfactory in practical use, for the reason thatthese clamps being actuated by fluid pressure, such," for instance, ascompressed air, depend entirely upon a constant application of apredetermined'pressure to the ram in order to maintain thev clamp initseffective position.y 'As a consequence, itis evident that any diminutionin the pressure will result in the. recession of the clamping memberfrom the work so that the *latter will be released.

Itis, therefore, the primary objectand purpose of my present improvementto provide a work clamp in axial alinement with the drill and selflocking power actuated means to move the work clamp to effectiveposition and maintainv the clamp in such position after the power hasbeen cut off or diminished.

1t is a fnrther object of my invention to provide a very simplemountingv and ar* rangement of the drill and work clamp with relation toa work rest, whereby the work may be accurately drilled and withaminimum of vibration of the several parts.

It is also an important object of theinvention to provide a *workholder'for drills as above characterized which may be readily applied oradapted'to use in. conjunction with either the horizontal or verticaltype of drill. Y

With the above and other objects in view, the invention consists intheimproved com-V bination, construction and relative arrange.- ment ofthe several parts, as willbe hereinafter more fully described,subsequently claimed and illustrated in the accompany# ing drawing inwhichn Figure 1 is aside elevation,` partly in E, ROHMER,

section, of a horizontal drill illustrating one embodiment of thepresent invention.

Fig. 2 is an end elevation, partly in secion. Fig. 3 is a view similarto Fig. 1 illustratti'ngfa slightly modified' form of the invenion.

Fig. 4 is an'elevation illustrating the invention as applied to avertical type of drill. Fig. 5 is an end view of the support and motordrill standard of the embodiment shown in Fig. 1.

Fig. 6 is a similar view of the form shown vin'F ig. 3; and Y F ig. 7 isa'plan View ofthe supporting table ofthe form shown inA Fig. 4 andshowing the machine in horizontal section.

Referring in detail to the drawing, `and more lparticularly'to Figs. 1and 2 thereof,

and purpose of this housing will be presently explained."

ln spaced relationY to the sleeve 2 a work rest 3 is mountedy upon thesupport 1, said 'fixed in the work rest 3 is engaged in this groove toprevent kturning movement of the work rest upon the support. This workrest may be securely locked Vin a Vlong gitudinally adjusted position onthe support by meansl of the set screw 26.

In'spaced relation to the work rest 3, the drill motor support 4 ismounted upon the main supporting rod 1, and is provided with standardsV26 and 27 at its opposite ends between which the motor designatedY 5 ismounted. The motor shaft is provided with a chuck 15 of any suitabletype in which the drill bit 14 is detachably held. The motor supportingcasting is formed VAwith a boss 19 housing a bolt on which is mountedthe circular key 18 engaging the key way.v A screw 20 isthreaded intheboss and coacts with the collar 19 to posi-` tion-the. samewithin thegroove or channel be securely held in its longitudinally adjustedposition on the support with respect to the work rest 3.

@ne side of the housing 2a is closed by the head ll, which is -formedwith a boss 11a. Upon the opposite side wall of the housing a similarbess 9L is formed. Within this housing` a rotor member l2 is arranged,said member having spaced radially disposed vanes and a central threadedbore. rlhis bore receives the thread @Voi a screw (i, said screw beingprovided on one of its ends with the work clamping head 'Z'. rllhe lowerside or the screw is formed with the keyway 14, which receives the endof a key 13 fixed in the boss 9. The opposite sides of the rotor memberl2 are recessed to 'receive suitable gaskets l0, which prevent leakageoi the pressure fluid from the housing. lt will be noted that there is aclearance between the thread o'i the screw and the walls of the bosses 9and lla, so that the screw will have a tree rectilinear movement throughthe housing when the rotor member 12 is rotated. y

The screw actuating member may be opcrated either pneumatically,hydraulically, or electrically. ln the present instance l haveillustrated pneumatic means for rotatingthe rotor member. The pressureiiuid supply pipe 16 extends through a tubular rod or supporti andbranch connections 2l and 22,'eXtending from the supply pipe andupwardly at opposite sides ot the sleeve 2. The upper ends ot thesebranches eXtend inwardly through the wall of the housing 2L at thebottom thereof, and each branch is equipped with a valve cock 23 and 24.rlhe housing 2a is provided at its top with an eri-- haust port 24a t'orthe pressure iiuid.

lt will be manifest 'from the above description that when the compressedair is let into the housing` through one of the branch pipes it willimpinge against the blades or vanes et the rotor member and rotate thelatter. As the screw 6 has a threaded connection with the member, thesaid screw will be moved axially and the clamping head 7 will be engagedagainst the work indicated at 8, which has been positioned against theside oit the work rest 3. This headis of hollow lform as shown toreceive the point yo't the drill bit and is provided with one .or moreopenings 25) through which the drill chips or shavings may pass. llhenthe head has been thus tightly clamped' against the work to rigidly and*securely hold the latter against the work rest, the pressure fluidfmaybe cut olii. rllhe clamping head will not re- .cede from its edectiveapplied position in view ott the tact that this head is positivelylocked against such movement by reason of the screw connection with therotor member 12. 'llhus the work cannot possibly move or shift duringthe drilling operation.

ln Fig. 3 of the drawing l have lillustrated a slightly modified formorp the invention.r` wherein the supporting rod 30 is formed with aflattened lower face 40. rlfhe work rest 38 is fixed in adjustedposition by means ot the set screw 39, which engages the face 40. 'lhedrill motor 34, which may be either ot the compressed air orelectrically actuated type, is mounted between the standards 32 oi thesupportingcasting 31 which is slidably engaged upon the rod 30. 'lhestandard is provided with a socketed hand' hold 32a. rlhis castingisixed in its longitudinally adjusted position by means ci the screw39a, holding the collars 391 tight around the supporting rod. As in theabove described form ot the invention, the drill 36 is secured in asuitable chuck 35.

t the relatively opposite side of the work rest 38, an elongatedcylindrical housing 42 is arranged and is integrally connected with thesleeve il mounted on the rod 30, the said sleeve being securely liXed tothe rod by one or more bolts or screws indicated at 50. rlhe workyclamping head 4A: in this embodiment et my invention is swiveled uponthe reduced end 43 et the screw e3. The screw threads i9 are engagedwith the complementary threads formed in the bores of the bosses l1a andllb on the opposite ends ot the housing 1.2. llilithin this housing therotormember 45 is arranged and iXed by means of the key 48 to anintermediate section of the screw 43. At opposite sides ont theintermediate portion of the rotary wheel l provide the series ofhelicoid vanos respectively designated 46 and 4l?, which entend inreverse directions to enable right and lett rotary motion on the outerperiphery of the rotor member.` The pistou rings 4:5@ are provided forthe tight and non-leaking performance at each side p of the rotormember.

The pressure tluidis supplied to the opposite ends oi the housingthrough a tube 565 -\Xtending from a suitable source ot supply, which isconnected to one end of a pipe 55 fixed a depending lug llc on thesleeve el] Branch pipes 5l and 53 extend upwardly from the pipe 55 andare equipped with the cut-oit" valves 52 and 54 respectively. rl`hesepipes extend through the opposite end walls ot the housing 42.

ln the operation oic the modified construction above described, it willbe apparent that when the pressure tluid is admitted to one end ot thehousing 42, the rotor member l5 therein will be rotated by the ractionoit the pressure iluid against one series ot the helicoid vanes. rlhismember being fixed upon the screw 43, the latter will be clamping head,after it is effectively engaged with the work, is securely7 locked orheld in such position while the supply of pressure fluid to the rotormember housing is completely cut oil?. The drill and the work rest maybe easily and quickly adjusted relative to each other upon the commonsupport and the drill bitV positioned into axial alinement with the workclamping head.

In Fig. el of the drawing .l have illustrated an `embodiment of myinvention asV applied to a vertical type of drill. In this arrangementthe work rest in the forms above referred to is dispensed with, and inlieu thereof a work support 63 is mounted uponA a rectangular extensiony73,011 the upper end 64 of the vertically disposed screw 62, which ismovable through the housing 6l, mounted on the frame 60, as Vat 65, byeither of the fluid pressure actuated means which I have hereinbeforedescribed. For this purpose a channeled plate or guide is fixed to theunder side of the support 63 to receive the extension 73. rllhis supportis also provided with extensions 72, which coact with the machine frameto guide the support in its vertical movement. The pressure fluid issupplied to the opposite ends of the housing 61 through pipes 7 and 77,which are equipped with the cutoif valves 76 Vand 78`respectively.

The drill 67 held in the chuck 68 is actuated through the medium of theshaft 69, which is provided on its upper end with a beveled gear 70,with which a complementary gear 7l. is engaged. rlhe latter gear isdriven through the medium of a belt wheel 7l or other equivalent means.66

Yindicates the work piece arranged on the support 63 and which ismaintained in proper engagement with the drill by the upward movement ofthe screw 62 actuated by the pressure controlled means within thehousing 6l, the continued upward movement of the support causing gradualpenetration of the drill. Y

From the foregoing description taken in connection with theaccompany/*ing drawing, the construction and manner of operation of eachof the illustrated embodiments of my invention will be clearly and fullyunderstood. Without greatly" complicating` devices which have heretoforebeen devised for the accomplishment of a similar purpose l havesucceeded in producing a ythoroughly practical and efhciently operatingwork clamp for use in connection with portable drills; rhe various partsof the device are of relatively simple form, not liable to get out oforder and may be manufactured and assembled at relatively small cost.

vlVhile l have herein illustrated and described several alternativeforms of the invention which l have found to be very satisfactory inpractice, it is nevertheless to be understood that the invention maylikewise be exemplified in manyother constructions, and l accordinglyreserve the privilege of adapting all such legitimate changes as may befairly embodied within the spirit and scope of the invention as claimed.

I claim:

l. ln a drilling apparatus, a support, a drill mounted upon saidsupport, a housingy secured on the support, a part movable through saidhousing and having Work engaging means on one of its ends, fluidactuated means engaged upon said part within the housing to axially movesaid part and effectively engage the work-engaging means with the work,and means associatedl with said part adapted to automatically establishand maintain a positive locking action to prevent retrograde movementthereof and positively lock the work holding means in its effectiveposition.

2. ln' a drilling` apparatus, a support, a drill mounted upon saidsupport, a housing secured on the support, a part rectilinearly movablethrough the housing and having work engaging means on one of its ends,

and a rotary duid actuated rotor member mounted within the housing andcoacting with said movable part to cause a rectilinear movement thereofin the rotation of said rotor member and effectively engage the workholding means with the work.

ln a drilling apparatus, a support, a drill mounted upon said support, ahousing secured on the support, a part rectilinearly movable` throughthe housing and having work engaging means on one of itsends, anda'rotary fieldA actuated rotor member mounted within the housing andcoacting with said movable part to cause a. rectilinear movement thereofin the rotation of the rotorv member and effectively engage the workholding means with the work, the coacting means bet veen said part andthe rotor member acting to positively lock said part against retrograderectilinear movement when vthe rotor member is stationary, and therebymaintain the work engaging meansin its effective position.

et. ln a drilling apparatus, a support, a drill mounted upon saidsupport, a housing secured on the support, a screw rectilinearly movablethrough the housing and having Work engaging means on one of its ends7and a rotor member mounted Within the housing and having threadedconnection with said screw whereby the screw is moved in the rotation ofthe rotor member to engage said Work engaging means with the Work, andsaid rotor member when stationary acting to positively lock the screw.against retrograde rectilinear movement,

and thereby maintain the Work engaging means in its effective position.

5. ln combination a i'ectilinearly movable Work engaging vmember, rotaryfiuid actuated means for moving said member into or out of engagementWith the Work and having means associated therewith for automaticallylocking said Work engaging member against reverse rectilinear movementin either direction upon a diminution in the pressure iniuence of theHuid medium.

n testimony that claim the foregoing as myl invention, have signed myname thereto.

GABRIEL E. ROHMER,

